And then there was one. With five games played, Arsenal are the only team in the UEFA Champions League with an unblemished record. The Gunners' impressive 3-1 win over Bayern Munich on Wednesday saw to that, but what of the other results this week?

What can we read into Chelsea 's confident 3-0 win over Barcelona ? What does Liverpool 's 4-1 capitulation at the hands of PSV Eindhoven -- at Anfield no less -- mean for under-fire Reds boss Arne Slot? And what on Earth was Pep Guardiola thinking when he named a second-string squad to face Bayer Leverkusen ?

Read on as ESPN experts Julien Laurens, Sam Tighe, Rob Dawson and Gab Marcotti answer all the big questions from Matchday 5.

- Arsenal remain perfect in Champions League, firm up contender status

- Lindop: Liver

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